Cutting tool



I. W.- GREEN CUTTING TOOL June 16, 1936.

2 sheets-sheet 1 Filed June 8, 1935 FIG./

IN I/E N TOR A W GREEN S F m 4 I. 3 4 N ,3 f /7 [1| 2 a 9 5 I g 2 2 6 3w .A 3 3 P K 0 N 9 2 r a g L Y 2 m w A TTORNE Y l. W. GREEN CUTTING TOOLJune 16, 1936,

Filed June 8, 1955 2 Sheets-Sheet 2 FIG. 3

k MU I INVENTOR A W GREEN A TTORNEY Patented June 16, 1936 CUTTING TOOLApplication June 8, 1935, Serial No. 25,689

8 Claims.

This invention relates to tools and more partic ularly to a type of toolfor use for cutting portions in the form of notches at the peripheriesof disc members to form code elements as used, for example, in telephonecall transmitters of the socalled repertory type.

In such call transmitters, as is well known, a member is positioned inoperative relation with a code element in the form of a notched disc foroperating shunting contacts which are provided for negativingpredetermined operations of a continuously operating pulsing mechanismfor transmitting sets of impulses according to the character or lengthof ridges formed at the periphery of the disc by the cutting of suchnotches. The portions thus removed from the periphery of the disc formthe so-called interdigit spaces which are provided so as to obtain acertain interval of time between each digit transmitted forpermittingthe proper operation of the selector switches at the exchange, suchdigit being determined as above described by the angular distance of theridge portions formed at the periphery of the disc by the cutting of thenotches.

The object of the invention is to provide a tool with which the formingof such code elements may be efiected in a convenient and accuratemanner.

According to the tool of the invention the operation of a finger wheelfor a selected digit appearing on a number-plate to a point determinedby a finger stop is effective to rotate a gearing mechanism foractuating a ratchet device and thereby a circular plate having means forengaging a radial slot in the disc for rotating it an angular distancecorresponding to the angular movement of the finger wheel. Means isprovided for yieldably holding the code element in concentric relationwith respect to its actuating circular plate and manually operable meansis provided for actuating cooperating cutting members upon eachoperation of the finger wheel for forming a notch at that point. Meansis provided for manually operating the wheel element of the ratchetmechanism independently of the operation of the finger wheel forrotating the circular plate and thereby positioning the code elementand. its. operating mechanism in normal starting position for theremoval of a completed disc and for the insertion of another code discfor a subsequent call designation forming operation, with means carriedby the wheel of the ratchet mechanism cooperating with an index formedwith the casing for indicating such starting position and means isprovided for yieldably holding such a wheel in each of its operatedpositions during the return movement of the finger wheel under thetension of a motor spring, in turn, controlled by the operation of aone-way effective governor mechanism.

Other features and advantages of the invention will appear from thefollowing description and by the claims appended thereto, referencebeing had to the accompanying drawings in which,

Figure 1 is a plan view;

Fig. 2 is a cross-sectional view taken on line 2-2 of Fig. 1;

Fig. 3 is a sectional view taken on line 33 of Fig. 2; and

Fig. 4 is an underside view of Fig. 2 showing the base in section takenon line 44 of Fig. 2.

The tool of this invention consists of a base i9 which is provided witha shoulder portion ll for mounting a casing CT provided with a num- 20ber plate NP and in this casing is journaled a centrally disposed shaft52 on which is securely mounted a finger wheel l8, a gear I6 and apinion M, shown in Fig. 2. The movement of finger wheel E8 in thedirection indicated by the arrow 25- in Fig. 1 is efiective to tension ahelical spring l3 and rotate the pinion H! of a one-way efiectivecentrifugal governor CG through its engagement with the gear 16, thisgovernor being provided for controlling the return movement of finger 30wheel I8 tonormal unoperated position and the actuating pawl of aratchet mechanism under the tension of helical spring l2, as will behereinafter described in detail.

On the underside of casing CT is loosely mount- 35' ed an intermediategear 2| which meshes with pinion l4 secured at the lower end of shaft l2and with a pinion 22 loosely mounted on the base Hi, this pinionengaging a gear sector 23 keyed on the top end of a spindle 24.

Spindle 24 is mounted in the hub portion 25 of a circular plate 26 whichis, in turn, rotatably mounted in a bearing portion 21 formed with thebase l6. On this base is mounted as on spring 28 a circular table member29 for receiving the disc element CE shown in dotted lines in Figs. 2and 3 to be formed with peripheral notches and having a slot 30 engaginga key member 3| secured to the underside of disc 26. The code element CEhas an opening engaged by a spring pressed pin 32 for holding the discinposition concentric with respect to the plate 26, and this plate 26carries at its underside a plurality of studs ST provided for holdingthis disc firmly on the table 29 through the tension of spring 28.

To the lower end of spindle 24 is secured as by a nut screw 34 an arm 33which carries at its free end a spring-pressed pawl 23 disposed inoperative relation with the teeth 35 of a ratchet wheel 36 having anotched ring 3'! secured to its underside and a knurled ring 38, thelatter being provided for manually rotating this wheel and thereby thecircular plate 26 independently of finger wheel I8 for a purpose thatwill be hereinafter described in detail.

As shown in Fig. 4 the notched ring 31 is engaged by rollers 39 and 40,as the case may be, mounted at the free ends of arms 4| and 42, in turn,pivotally mounted on the base l0 and held in engaged relation with thenotched ring 31 by a spring 43, this ring being mounted on the lower endof sleeve or hub 25 of plate 26 and is securely held thereby by nut 44.i

The base ii] is provided with a straight portion 55 shown in Figs. 2, 3and 4 provided for mounting a stationary cutting element 45 registeringwith a cooperating movable cutting element 46 carried by a manuallyoperable lever member 41. This lever member is mounted on pivot 56supported by lugs 43 and 49 projecting perpendicularly from the base I0and a spring 50 having one end engaging a pin 5i carried by lug 48 .andthe underside of the spacer flange member SI of lever 41 is provided forholding this lever in its unoperated position, as shown in Fig. 2, theeffective portions of cooperating cutting elements 45 and 43 beingsubstantially segment-shaped and of a width such as to cut apredetermined number of teeth, such as TH, or equivalent portion to form.at the periphery of the disc CE an interdigit space which is equal tothe movement of finger wheel 58 from the word END to the finger stop FS,as shown in Fig. 1.

In a typical code forming operation the disc CE which may be providedwith a continuous row of teeth, such as TH, shown in Fig. 3 is insertedbetween the circular plate 26 and the circular table 29 with its slot 33registering with the key 35 of plate 26 wherein the spring-pressed pin32 engages with the opening in the disc for holding it in concentricrelation with respect to the circular table 23 and rotatable plate 23shown in Fig. 2, with the index IN registering with the mark inscribedon the knurled ring 38 carried by ratchet wheel 35 as shown in Fig. 3. Amovement of the finger wheel I8 from digit 3, for example as incheatedby the number plate NP to the position against the finger stop FS iseffective to actuate pinion l4 for moving the gear sector 23 through theintermediary gears 2i and 22 .and thereby the arm 33 and the pawl 23carried thereby for operating the ratchet wheel 35 an angular distancecorresponding to the ratio of gear I4 and 23, that is equal to nineteeth of this wheel which corresponds to nine teeth TH of the codeelement CE. The finger wheel I8 is then released to permit it to returnto normal under the tension of spring 13 controlled by the governor CG,the ratchet wheel 36 remaining in its advanced position by the tensionof spring 43 acting on arms 4| and 42, one of them engaging the notch inthe ring 3'! carried by the wheel 36. The manually operable lever arm 41is moved downwardly against the resistance of its retractile spring 50for cutting a number of teeth or equivalent portion from the codeelement corresponding to the width of the cutting members 45 and 46,that is, six teeth to form the interdigit portion P, thus leaving threeteeth at the periphery of the disc of the nine teeth involved in thisexample of dialing operation. In a second operation of finger wheel 3,as above described, from digit 8, for example, as indicated by thenumber plate NP to the position determined by the stop FS is effectiveto actuate the arm 33 as to advance the wheel 35 twelve teeth whereinthe operation of the cutting element 45 through the downward movement oflever 47 is effective to out six teeth in the manner above described,thus leaving six teeth at the periphery of the disc and this operationis continued to the completion of the code forming operation whichincludes the cutting of the remaining teeth at the periphery of the discwhich are not used in the formation to a particular code designation.The cutting operation of such remaining teeth is effected by moving thefinger wheel l8 from the position indicated by the word END on thenumber plate against the finger stop and operating the lever 41 aftereach operation of the finger wheel, such angular movement being equal tosix teeth of the disc and equal to the width of the cutting elements 45and 46. In cases where a number of such operations position the mark onthe ring 38 past the index IN formed with casing ID, the ratchet wheel36 may be moved manually in the direction indicated by the arrow in Fig.4 independently of the finger wheel ii? for positioning the plate 23 inthe starting or normal position and thereby permitting the removal ofthe completed disc and the insertion of another disc.

What is claimed is:

1. A tool for cutting portions at the periphery of a disc member to forma code designation, said tool comprising a pair of clamping plates forreceiving the disc, a number plate, a manually operable member havingmeans registering with said number plate for actuating one of saidclamping plates in a plurality of variable steps for moving said disc,and means for cutting a portion at the periphery of the disc in placesdetermined by the extent of each of said steps as indicated by saidnumber plate.

2. In a tool for cutting portions at the periphery of a disc to form acode element, a pair of cooperating segment shaped cutting members, apair of clamping plates for yieldably holding the disc in cuttingrelation with said members, means defining a number plate, a fingerwheel and a gear mechanism for imparting predetermined movements to oneof said clamping plates for successively positioning the disc withrespect to said members, and means for operating one of said members forcutting portions of the disc according to the formation of said membersin each of the movements of the finger wheel with respect to said numberplate.

3. In a tool for cutting portions at the periphery of a disc to form acode designation, a pairof circular clamping plates for operativelyreceiving the disc and having means for yieldably holding the disc inconcentric relation therewith, cooperating cutting members disposed inoverlapping relation on the peripheral portion of the disc, a numberplate, a manually operable member having means registering with saidplate for imparting variable step-by-step angular movements to one ofsaid plates for positioning the disc with respect to said memberswhereby the operation of one of said members at the end of each step iseffective to out a portion of the disc to form a notch.

4. In a tool for cutting portions at the periphery of a disc member toform a code element, a pair of cutting members, a finger wheel. a numberplate, a finger stop, a pawl actuated by the movement of said fingerwheel, a ratchet wheel rotated by the movement of said pawl, a mountingplate actuated by said ratchet wheel for operating the disc, cuttingmembers, and a handle lever for actuating one of said members forcutting portions at the periphery of the disc upon each adjustingmovement of said finger wheel.

5. In a tool for cutting portions at the periphery of a disc member toform a code element, a finger wheel, a number plate, a finger stop, agearing mechanism actuated by said finger wheel from a selected point onsaid number plate to said finger stop, cooperating segmental shapedcutting members, a ratchet mechanism operatively connected to said gearmechanism, a clamping plate operated by said ratchet mechanism forrotating the disc with respect to said cutting members, manuallyoperating means for operating one of said members for cutting a portionat the periphery of the disc as determined by the character of saidmembers, a retractile spring for said finger wheel, and a governor forcontrolling the return movement of said finger wheel.

6. A tool for cutting portions at the periphery of a disc member to forma code element as used in call transmitters, said tool comprising a pairof cutting members, a mounting, a finger wheel, a number plate securedto said mounting, a supporting shaft for said finger wheel, a pinioncarried by said shaft, a gear sector actuated by said pinion, a ratchetmechanism operable through the movement of said gear sector and advancedin one direction upon each adjusting movement of said finger wheel and acircular plate actuated by the operation of said ratchet mechanism forpositioning the disc with respect to said cutting members, and means foractuating one of said members for cutting portions of the disc upon eachadjusting movement of said finger wheel as indicated by said numberplate.

'7 In a tool for cutting portions at the periphery of a disc member usedas a code element in call' transmitters, said tool comprising a pair ofcutting members, a rotatable wheel having a plurality of finger holesequally spaced in a portion of its circumference, a plate having codedesignations registering with the holes of said wheel, a finger stop forlimiting the movement of said wheel from any one of said finger holes, ashaft for said wheel, a pinion carried by said shaft, a gearing and aratchet mechanism operated by said pinion, means actuated by saidratchet mechanism for moving the disc member according to the successivemanual operation of said wheel from said designations to said fingerstop for positioning said disc with respect to said members and meansfor actuating one of said members for cutting portions at the peripheryof the disc upon each operation of said finger wheel.

8. In a tool for cutting portions at the periphery of a disc member usedas code elements in a repertory dial and having a radial slot, said toolcomprising a pair of cutting members, a finger wheel, a number plate, afinger stop for limiting the movement of said finger wheel from pointsindicated on said number plate, a shaft for said finger wheel, a pinioncarried by said shaft, a gear sector actuated by said pinion, a basehaving a bearing portion, a circular plate having a sleeve portionrotatably mounted in said bearing, another shaft for said gear sectordisposed concentric to the first mentioned shaft, an arm carried by thesecond-mentioned shaft, a pawl carried by said arm, a ratchet wheelcarried by said sleeve and engaged by said pawl, a key member carried bysaid circular plate engaging the slot in the disc for rotating it uponthe operation of said ratchet Wheel, a spring tensioned by the selectivemovement of said finger wheel for returning it to normal when releasedby the operator upon reaching said finger stop, a governor forcontrolling such return movement, means for yieldably holding theratchet wheel and the disc in each adjusted position with respect tosaid cutting members, and manually operable means for actuating one ofsaid members for cutting a portion at the periphery of the disc in eachadjusted position as determined by the angular movement of said fingerwheel from any number on said number plate.

IRVING WALTER GREEN.

